A Type II Supernova occurs when a massive star, typically more than eight times the mass of the Sun, exhausts its nuclear fuel. As the core collapses under gravity, it creates an incredibly dense neutron star or black hole, while the outer layers are expelled violently into space. This explosion can outshine entire galaxies for a short period. These supernovae are important for the universe as they distribute heavy elements, like iron and carbon, into the interstellar medium. This process contributes to the formation of new stars and planets, playing a crucial role in the cosmic cycle of matter.